2a thread class right-hand 0.697" thread length hexagon head style 0.140" hole diameter 24 thread quantity per inch 1 head washer faced 1/32 in. approx 2 21/64 in. dia of unthreaded portion cadmium or zinc surface treated unf thread series
3a thread class right-hand 0.490" thread length hexagon head style 0.040" grip length 24 thread quantity per inch cadmium surface treated unf thread series
3a nut thread thread class right-hand nut thread 0.562" stud thread thread length 4.500" overall length 16 stud thread thread quantity per inch 0.375 in. spherical radius on nut end; 45.0 to 50.0 degree chamfer on stud end unc stud thread thread series